Neck portion of a shirt



FIG. 1 is a perspective view of a neck portion of a shirt, showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a left-side elevational view thereof;

FIG. 5 is a top plan view thereof; and,

FIG. 6 is a bottom plan view thereof.

The broken lines showing a person and a remaining portion of the shirt in FIG. 1 depict environmental matter and form no part of the claimed design. The remaining broken lines represent stitching, and are part of the claimed design. 

CLAIM I claim the ornamental design for a neck portion of a shirt, as shown and described. 